function varargout = parseMeshData(varargin)
%PARSEMESHDATA Conversion of data representation for meshes
%
%   MESH = parseMeshData(VERTICES, EDGES, FACES)
%   MESH = parseMeshData(VERTICES, FACES)
%   [VERTICES, EDGES, FACES] = parseMeshData(MESH)
%   [VERTICES, FACES] = parseMeshData(MESH)
%
%
%   See also
%   meshes3d, formatMeshOutput
%
% ------
% Author: David Legland
% e-mail: david.legland@inra.fr
% Created: 2010-12-06,    using Matlab 7.9.0.529 (R2009b)
% Copyright 2010 INRA - Cepia Software Platform.

% initialize edges
edges = [];

% Process input arguments
switch nargin
    case 1
        % input is a data structure
        mesh = varargin{1};
        vertices = mesh.vertices;
        faces = mesh.faces;
        if isfield(mesh, 'edges')
            edges = mesh.edges;
        end
    case 2
        % input are vertices and faces
        vertices = varargin{1};
        faces = varargin{2};
    case  3
        % input are vertices, edges and faces
        vertices = varargin{1};
        edges = varargin{2};
        faces = varargin{3};
    otherwise
        error('Wrong number of arguments');
end

varargout = formatMeshOutput(nargout, vertices, edges, faces);
